目的 观察重组人骨形成蛋白2(recombined human bone morphogenetic protein 2, rhBMP-2)异位诱导成骨过程中神经生长因子(nerve growth factor, NGF)及其高亲和力受体(tyrosine kinase receptor A, TrkA)的表达,探讨NGF在BMP骨诱导中的作用。 方法 ICR小鼠36只,随机分
细胞系统中发现有N GF 及其受体的表达[12]。我们实
验还发现14d 新生骨组织表面的破骨细胞以及骨髓组织中单核巨噬细胞和多核巨噬细胞中呈现与N GF 及T rkA 相同程度的阳性表达,21d 阳性表达数量减少。这一结果提示在诱导成骨过程中,破骨细胞和骨髓中单核巨噬细胞、多核巨噬细胞可能通过释放N GF 调节破骨细胞的骨吸收活性[13]。
我们研究提示外源性BM P 骨诱导过程中N GF 及其T rkA 的表达,表明N GF 可能通过直接作用于局部细胞或间接诱导神经纤维长入的方式参与诱导成骨过程。另外,已有文献报道[14,15],N GF 还具有抗缺血性凋亡、刺激毛细血管再生和调节免疫系统等作用。因此,在成骨过程中所表达的N GF ,还可能同时通过更为广泛的途径来作用于BM P 诱导成骨过程。
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(收稿:2005207225 修回:2006201210)
(本文编辑:董奇男 刘丹)
・致读者・
2006年本刊重点专题栏目介绍
为了给广大读者提供更广阔的交流空间,我刊拟定于2006年推出以下重点专题栏目:
①干细胞与组织工程 ⑥四肢运动功能重建 ②肿瘤切除的修复⑦颅面修复 ③周围神经修复⑧足外科 ④肢体血循环重建⑨膝关节置换 ⑤组织移植创面修复
βκ脊柱、脊髓损伤修复
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2006204201
・854・Ch inese Journal of R eparative and R econstructive Surgery ,2006,V o l 20(4)